Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
A148899
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =31a(5) =107a(6) =407a(7) =1563a(8) =6307a(9) =25314a(10) =104211a(11) =434811a(12) =1834609a(13) =7775478a(14) =33349109a(15) =144050282a(16) =625106289a(17) =2726906876a(18) =11972170104a(19) =52763988723a(20) =233310974520
External references
- oeis: A148899